Possible you didn't hit the right temp on the sugar (soft ball, hard crack etc) did you temp it with a sugar thermometer as you were doing it? Should be around 300 degrees for a hard crack and then it wouldn't be gummy.

Chef EdBOver 50 years in food service business 35 as Ex Chef. Specializing in Volume upscale Catering both on and off premise .(former Exec. Chef in the largest on premise caterer in US with 17 Million Dollars per year annual volume). Well versed in all facets of Continental Cuisine...

Chef EdBOver 50 years in food service business 35 as Ex Chef. Specializing in Volume upscale Catering both on and off premise .(former Exec. Chef in the largest on premise caterer in US with 17 Million Dollars per year annual volume). Well versed in all facets of Continental Cuisine...